How do you separate SiO2 and NaCl? Extraction of NaCl. Weigh a second, clean, dry, evaporating dish. Add between 5 and 7 mL of distilled water to the NaCl-SiO2 mixture and stir gently for 5 minutes. Carefully decant the liquid from the first evaporating dish into the second evaporating dish, leaving the solid behind. What […]
How do you find the heat capacity of a reaction?
How do you find the heat capacity of a reaction? Enthalpy of Solution (Heat of Solution) Example Calculate the heat released, q, in joules (J), by the reaction: q = mass(water) × specific heat capacity(water) × change in temperature(solution) Calculate the moles of solute (NaOH(s)): moles = mass ÷ molar mass. Calculate the enthalpy change, […]
Which element in Period 2 has the least mass?
Which element in Period 2 has the least mass? lithium Which metal has the largest atomic mass? osmium Which element below has the smallest atomic radius? Helium Which element in group 14 has the largest atomic radius? lead What is carbon’s atomic radius? 170 pm How we can calculate atomic radius? Subtract the radius of one […]
What are the 7 types of invertebrates?
What are the 7 types of invertebrates? There are seven primary groups of invertebrates in the animal kingdom. They are sponges, ctenophores, cnidarians, echinoderms, worms, mollusks and arthropods. Is snake a vertebrate? Snakes belong to the vertebrates, along with all other reptiles and amphibians, mammals, birds, and fish. All these animals have an inner skeleton. […]
What is change of state of a substance?
What is change of state of a substance? From Solid to. Liquid to Gas A change of state is the change of a substance from one physical form to another. All changes of state are physical changes. The particles have different amounts of energy when the substance is in different states. What happens when a […]
How do the layers of rocks relate to one another?
How do the layers of rocks relate to one another? Layering, or bedding, is the most obvious feature of sedimentary rocks. This Law of Superposition is fundamental to the interpretation of Earth history, because at any one location it indicates the relative ages of rock layers and the fossils in them. Layered rocks form when […]
How can I tell if a head injury is mild or severe?
How can I tell if a head injury is mild or severe? Signs may not appear for days or weeks after the injury. Some symptoms last for just seconds; others may linger….Signs of traumatic brain injury include: Confusion or feeling dazed. Clumsiness. Slurred speech. Nausea or vomiting. Headache. Balance problems or dizziness. Blurred vision. Sensitivity […]
What are the five methods of acquiring knowledge?
What are the five methods of acquiring knowledge? The methods of acquiring knowledge can be broken down into five categories each with its own strengths and weaknesses. Intuition. The first method of knowing is intuition. Authority. Perhaps one of the most common methods of acquiring knowledge is through authority. Rationalism. Empiricism. The Scientific Method. How […]